#include<bits/stdc++.h>
#define y1 Y1
#define fi first
#define endl "\n"
#define se second
#define PI acos(-1)
#define int long long
#define pb(x) push_back(x)
#define PII pair<int, int>
#define Yes cout << "Yes\n";
#define No cout << "No\n";
#define YES cout << "YES\n";
#define NO cout << "NO\n";
#define _for(i, a, b) for(int i = a; i <= b; ++i)
#define IOS ios::sync_with_stdio(false),cin.tie(0),cout.tie(0)
using namespace std;

const int N = 2e5 + 10;
const int mod = 1e9 + 7;

int a[N];
int n, m, t, ret;
string s;

signed main() {
	IOS;
	n = 9;
	_for(i, 1, n) {
		cin >> a[i];
	}
	int ret = 0;
	_for(i, 1, 4) {
		if(i != 4) {
			ret += (a[i] * a[i + 5]);
		} else {
			ret -= (a[i] * a[i + 5]);
		}
	}
	ret -= a[5];
	
	cout << (ret > 0 ? "YES" : "NO") << endl;
	return 0;
}


